unchecked-abstract.scala:16: warning: abstract type H in type Contravariant[M.this.H] is unchecked since it is eliminated by erasure
    /*   warn */ println(x.isInstanceOf[Contravariant[H]])
                                       ^
unchecked-abstract.scala:21: warning: abstract type H in type Contravariant[M.this.H] is unchecked since it is eliminated by erasure
    /*   warn */ println(x.isInstanceOf[Contravariant[H]])
                                       ^
unchecked-abstract.scala:27: warning: abstract type T in type Invariant[M.this.T] is unchecked since it is eliminated by erasure
    /*   warn */ println(x.isInstanceOf[Invariant[T]])
                                       ^
unchecked-abstract.scala:28: warning: abstract type L in type Invariant[M.this.L] is unchecked since it is eliminated by erasure
    /*   warn */ println(x.isInstanceOf[Invariant[L]])
                                       ^
unchecked-abstract.scala:31: warning: abstract type H in type Invariant[M.this.H] is unchecked since it is eliminated by erasure
    /*   warn */ println(x.isInstanceOf[Invariant[H]])
                                       ^
unchecked-abstract.scala:33: warning: abstract type L in type Invariant[M.this.L] is unchecked since it is eliminated by erasure
    /*   warn */ println(x.isInstanceOf[Invariant[L]])
                                       ^
unchecked-abstract.scala:36: warning: abstract type H in type Invariant[M.this.H] is unchecked since it is eliminated by erasure
    /*   warn */ println(x.isInstanceOf[Invariant[H]])
                                       ^
unchecked-abstract.scala:37: warning: abstract type T in type Invariant[M.this.T] is unchecked since it is eliminated by erasure
    /*   warn */ println(x.isInstanceOf[Invariant[T]])
                                       ^
error: No warnings can be incurred under -Xfatal-warnings.
8 warnings found
one error found